Sites and apps similar to Loadster include Apache JMeter, which is free and open source. Other options are Low Orbit Ion Cannon, locust, Loader.io and YandexTank. There's no shortage of Website Monitoring Tools like Loadster, with more than 25 alternatives for Windows, Linux, Mac, self-hosting and Chrome OS.
AppPerfect Load Test is a fully automated load test, stress test and performance test solution that helps you design and simulate thousands of users in a realistic manner which can be used to load test your application infrastructure for performance, reliability and scalability.
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The Grinder is a Java load testing framework that makes it easy to run a distributed test using many load injector machines. It is freely available under a BSD-style open-source license.
Pylot is a free open source tool for testing performance and scalability of web services. It runs HTTP load tests, which are useful for capacity planning, benchmarking, analysis, and system tuning.
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